new once-a-day antihistamine for allergies called Zyrtec (ZIR-tec, cetirizine)

Pfizer's coming out with a new once-a-day antihistamine for allergies called Zyrtec (ZIR-tec, cetirizine).

The company will promote it as "low-sedating."

Zyrtec is a metabolite of hydroxyzine (Atarax, etc). It's LESS sedating than hydroxyzine or diphenhydramine...but MORE than Seldane and the other non-sedating antihistamines.

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